With implementation of GDPR and other privacy laws, we are increasingly seeing companies explaining, now more so, in details about what information they collect about us. It serves as a good guide for knowing more about the tech stack, and other strategies companies use. Smaller companies, especially startups could follow the lead and add some of them to their product pipeline. Here an how the cookie list from quora looks like, https://www.quora.com/about/cookie_list